Manufacture of bags



Feb. 11, 1958 R. J. WILLIAMS ET AL 2,822,733

MANUFACTURE OF BAGS s Sheets-Sheet 1 Filed Avril 5, .1954

IIIIH: lllllllliFllllllll lli Feb. 11, 1958 R. J. WILLIAMS ETAL 2,822,733

MANUFACTURE OF BAGS Filed April 5, 1954 3 Sheets-Sheet 2 Feb. 11, 1958 Filed April 5, 1 954 R. J. WILLIAMS ETAL MANUFACTURE OF BAGS /II//IIII/III/IIIII 3 Sheets- Sheet a nited States Patent 2,822,733 r MANUFACTURE'OF BAGS RusselLJ. Williams, Clayton, andMiltontJ; Heiinos, Le-

may 0., assignors to. Bernis, Bro. Bag Company, St. Lours,'Mo., a corporation of"Missouri Application Apr l. 5, 1954, \SerialNov 420,958:

7 Claims. (Cl; 93-8) This'invention relates to the. manufacture of bags; and more partlcularly to apparatus for and methods of manufacturing a continuous multi-ply. web? having patches-between the. plies thereof spaced at intervals along thelength of the web, and adapted to be-fo'rmed into bags:

The manufactureof, several different types offmulti ply paper bags involves the-insertionof'patches betweenthe plies. One such type of bag is a window bag havinga patch of open-mesh fabric in the window; such-asis shown imEig. ll of U. S. Patent-2,428,266. Among the= several objects of thisinvention may b'e noted theprovision of an improved and simplified apparatus for and in the longitudinal direction of thewebi- OthePobjectspart apparent and-in part pointed and-features will be in out hereinafter. v

The invention accordingly comprisesthe-"constructions and methods hereinafter-described, the scope of-theiinvention being indicated in the fol1owing claims.-

In the accompanying drawings, inwhich one of "various possible embodiments of i the inventionisillustrated;

Fig. 1 isa view in'transverse elevationof'p'art-of a bag machine equippedwithapparatus of 'this invention, parts being broken away;

Fig. 2 is a verticalcross section taken on line of Fig.1;

Fig. 3 is a fragmentofFig: 2 with certain details omitted illustrating a moved position of parts;-

Figs. 4 and 5 are vertical cross sections-takemonlines;

44 and 5-5, respectiye1y,'of-Eig. 1; and

Figs. 6 and 7 arecross-sections-talen onlines- 6 --6 and 7'-7, resp ectively, of'Fig, 4. 1 Corresponding reference characters indicatecorresponding parts throughout the several view's fo --th'e dr awmgs.

Referlfing'to'the drawings, reference charaeters l and 2 designatethe side frame's of aconventionalf bag ma chine having an apparatus of this inventlomrinst'alled; therein: These 'are'brac'ed"by a-cross-channele3: Across;-

shaftof the bag machine isiindi'cated att4z At-15 istsliow r. a combining guide; This consistsi oft-aroll-y ournalled;

at; its I ends infbearingst 721 These hearings; are mounted onrinclined faces: 83-01: the: sideaframesg as l;1y;- mean.&.;ofscrews 9ze'xtending, through: slot-s;-,10; in the be arings and, may. be adjusted on the faces; 8; (Screws: .-9*bei11g loosened) to:vary:th. posi ion f=,the; roll-l, Webs W L ndW L uR:

pliedi from web -rol1s- (not shown) arev guidcd fon .travel 5 2,822,733 Riitented Feb. 11, 1958 toward the H combining, rollflS; in, spaced apart paths-,awithi the ,web's converging at-the-combining-rroll tofonn a. two.-;

ply1 webtW, the latter travelling. on throughJhe bag machine wherein it t isgformed" into bags, in conventional bining roll, and the .web W-Zis shown as travelling around:

guide rolls 12iand13 and thenceinareachR-Z inc ined" forward and downward to the combining roll. The bite; of webs W-l and W-,'-2, i.v e., the transverse line on wh ich" they come into engagement,,is;indicated,at B. Y

Reference character. 15. generally designatesgav patch: cutter unit for severingpatchesrfrom a web W-3 of; patch material, such as .paper,-or open-mesh fabric,;supplied from a web roll (not shown). As shown, the patch cutter unit is mounted on a pair of bars 17 and, 19 which extend between the side frames 1 and, 2 in the space-between the ply-forming webs W4 and W-'2 where 1they converge toward the combining roll; It comprises-a pair; of side framesll and 23tied together by a cross-girt 25; Each of side frames .21 and 23;has,'a notch 27'at'its-forwardlower corner-receiving bar 17 and 'a notch 29v'at itsrearward lower corner receiving bar 19. The side frames 21-and231are fixed'on the bars 17 and 19 by; clamp members'31 engaging the bottoms -;of bars ;17 and- 19, clamp screws 33' extending through holes in the-members 31 and being threaded in the side frames-21 and 23.

The patch cutter unit includes means for feeding the patch-forming web W-3.. into thebitc B of the ply-forming Webs W-l andW-2. As shown, this meansrcomprises a pair ofdraw rolls 35 and 37 extending between the side frames 21 and 23. Roll 35 'is journalled at its ends in bearings 39 located at the inner ends of slots 41 in side frames 21 -andi23; Roll 37 ist journalled at its ends in bearings 43 slidable in the slots 41; Roll 37 is biased: away from roll'35 by springs 45' reacting. from bearings 39 against bearings 43. Caps .47 close the open ends of the slots. These caps are slidable on screws 49-and-arezv biased against the edges of the side frames byspringssl. A shaft 53' extendsthroughbearings 55 slidablesin'the, slots between the bearings43 and thecaps. Screws 57 threaded in the caps limit the:outward movement of the; bearings 55. Fixed on the'shaft 53 are eccentricsi59 engageable with-the bearings43. Shaft 53 has anhandler 61 outward of *side frame 21 and-is rotatable l;vas determined by engagement-ofa-pin 63-extendingradially= from the shaft with a pair of stops 65onthe sidelframe, 21," for-rotating the eccentricszfrom; a draw roll:closing position wherein the rolls m-aygripzweb W-3-therebetween: to-adraw rollireleasing positionallowing'roll 37 to'sepa rate from roll 35 for. web-threading purposesr, The-pass; plane of'the drawv rolls-is:l0catedbetween the-planes of; the conVergent reaches; R-l and-R l of W6bS W 1f-a l1dj W2- and substantially t angenkto the; combining; roll at;

the bite B of the webs W-l and W4.

In: 19,: The anv 1 s:' uh antial yjtangent tethepas s has.

speed. Draw rolls 35 and 37 are driven to feed the patchforming web W3 at a speed lower than the speed of webs W-1 and W-Z, and the anvil roll 67 and knife roll 69 aredriven at a speed so related to the speed of the draw rolls as to cut patches of the desired size. The drive for these elements is taken off a shaft 87 of the bag machine via a train of gears including a gear 89 on shaft 87, an idler gear 91 iournalled in a bearing bracket 93, and a gear 95 on the anvil roll shaft 73, the latter extending beyond side frame 2 and being journalled in an outboard bearing bracket 97. A gear 99 on the anvil roll shaft 73 outward of side frame 23 meshes with a gear 101 on the knife roll. shaft 73 via a change gear- 103 on shaft 73 outward of side frame 21, an idler gear 105 carried by a pivoted sector 107, and a gear 109 on the roll 35. A gear 111 on the roll'35 outward of the side frame 23 meshes with a gear 113 on draw roll 37 to drive the latter. At 115 is shown a gear in mesh with a gear 117 on shaft 87 for driving the latter.

Operation is as follows:

Draw rolls 35 and 37 are continuously driven to feed the patch-forming web W-3 at a speed lower than the speed of ply-forming webs W-1 and W-2 appropriate to the desired spacing for the patches along the length of the composite web W. It will be understood that the lower the speed of the web W-3, in relation to the speed of webs W-l and W-2, the greater the spacing of the patches, and vice versa. Different draw. roll speeds may be obtained by changing gears at 103. Web between the anvil roll 67 and the knife roll 69, which are driven at a speed so related to the speedof web W-3 as to cut a patch P (see Fig. 3) of the desired length upon each revolution of the knife roll. The rolls 35, 37, 67 and 69 rotate in the directions indicated by the directional arrows in Figs. 2 and 3. The distance from the transverse cut line C where the knife 71 on the knife roll cuts the web W-3 against the anvil 67 is spaced from the bite B of the ply-forming webs W-l and W-2 a distance corresponding generally to the length of the cut patches. This distance may be set by adjustment of the combining roll 5. It need not be exactly the length of a patch.

The knife roll is timed to cut the web W-3 substantially at the instant that the end of the web W3, as fed forward by the draw rolls, is caught in the bite B of the ply-forming webs W-l and W-2 (see Fig. 3). The patch, immediately upon being cut, and having its forward end caught in the bite of webs W4 and W4, is drawn in between webs W-l and W4 at the speed of Webs W-1 and W4. Since web W-3 is fed at a speed lower than the speed of webs W-l and W-2, the patch is pulled away from the freshly cut end of web W3, and thus becomes spaced from the next patch to be cut. When the patch P is cut and drawn in between the webs W--1 and W4, web W-3 continues to feed forward between the anvil roll and the knife roll toward the bite B (see Fig. 2), and when the knife roll completes a revolution from the cutting position shown in Fig. 3, another patch is cut, and so on.

In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.

As various changes could be made in the above constructions and methods without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

We claim:

1. Apparatus for forming a continuous multi-ply web having patches between the plies thereof with the patches spaced at intervals along the length of the web, comprising a combining guide, means for guiding a plurality of continuous ply-forming webs for travel at a predeter- Draw roll 35 is driven from the anvil roll W-3 is fed mined speed toward the combining guide in spaced paths with the webs converging together to meet at the combining guide, a cutter located in the space between the plyforming webs where they converge toward the combining guide, and means for continuously feeding a patchforming web at a speed lower than the speed of said ply-forming webs past the cutter and into the bite of said ply-forming webs where they meet at said guide,

said cutter being positioned for travel of the patch-forming web in a substantially straight-line path from the cutter to the combining guide and into the bite of said plyforming webs, said cutter being so located relative to the combining guide as to cut off the patch-forming web on a transverse cutting line spaced from the bite of said ply-forming webs a distance measured along said straightline path corresponding generally to the desired patch length, and means for operating said cutter and timing the operation thereof to cut the patch-forming web to form a patch substantially at the instant that the end of said patch as cut from the patch-forming web is caught in the bite ofv said ply-forming webs, whereby the patch immediately upon being cut is drawn in between the plyforming webs at the speed of 'the ply-forming webs, and is pulled away from the freshly cut end of the patchforming web.

2. Apparatus for forming a continuous tmulti-ply web having patches between the plies thereof with the patches spaced at intervals along the length of the web, comprising a combining guide, means for guiding a plurality of continuous ply-forming webs for travel at a predetermined speed toward the combining guide in spaced paths with the webs converging together to meet at the combining guide, a cutter, including a rotary knife located in the space bet-ween the ply-forming webs where they converge toward the combining guide, means for continuously feeding a patch-forming web at a speed lower than the speed of said ply-forming webs past the cutter and into the bite of said ply-forming webs where they meet at said guide, said feeding means and said cutter being so positioned relative to one another and to the combining guide that the patch-forming web travels in a substantially straight-line path from the feeding means past the cutter to the combining guide and into the bite of said ply-forming webs, said cutter being located relative tothe combining guide for cutting off the patchforming web on a transverse cutting line spaced from the bite of said ply-forming webs a distance measured along said straight-line path corresponding generally to the desired patch length, and means for rotating the knife and timing the operation thereof to cut the patch-forming web to form a patch substantially at the instant that the end of said patch as cut from the patch-forming web is caught in the bite of said ply-forming webs, whereby the patch immediately upon being cut is drawn in between the ply-forming webs at the speed of the ply-forming webs, and is pulled away from the freshly cut end of the patch-forming web.

3. Apparatus for forming a continuous multi-ply web having patches between the plies thereof with the patches spaced at intervals along the length of the web, comprising a combining roll, means for guiding a plurality of continuous ply-forming webs for travel at a predetermined speed toward the combining 11'011 in spaced paths with the webs converging together to meet at the combiningroll, a cutter comprising a rotary anvil and a rotary knife located in the space between the ply-forming webs where they converge toward the combining roll, a pair of draw rolls for feeding a patch-forming web at a speed lower than the speed of said ply-forming webs between the anvil and knife into the bite of said plyforrning webs where they meet at said combining roll, the pass plane of said draw rolls and cutter being substantially tangent-to the combining roll at the bite of said ply-forming webs, said knife being located to cut off the patch-forming web on a transverse cutting line spaced.

from the bite of said ply-forming webs a distance corresponding generally to the desired patch length, and being operable to cut the patch-forming web to form a patch substantially at the instant that the end of the patch forming web is caught in the bite of said ply-forming webs, whereby the patch immediately upon being cut is drawn in between the ply-forming webs at the speed of the ply-forming webs, and is pulled away from the freshly cut end of the patch-forming web.

4. Apparatus for forming a continuous multi-ply web having patches between the plies thereof with the patches spaced at intervals along the length of the web, comprising a combining roll, guide rolls for guiding two continuous ply-forming webs for travel at a predetermined speed toward the combining roll in convergent reaches meeting at the combining roll, a cutter comprising a rotary anvil and a rotary knife located in the space between the plyforming webs where they converge toward the combining roll, a pair of draw rolls for feeding a patch-forming web at a speed lower than the speed of said ply-forming webs between the anvil and knife into the bite of said plyforming webs where they meet at said combining roll, the pass plane of said draw rolls and cutter being substantially tangent to the combining roll at the bite of said ply-forming webs, said knife being located to cut off the patch-forming web on a transverse cutting line spaced from the bite of said ply-forming webs a distance corresponding generally to the desired patch length, and being operable to cut the patch-forming web to form a patch substantially at the instant that the end of the patchforming web is caught in the bite of said ply-forming webs, whereby the patch immediately upon being cut is drawn in between the ply-forming webs at the speed of the ply-forming webs, and is pulled away from the freshly cut end of the patch-forming web.

5. Apparatus as set forth in claim 4 wherein the combining roll and cutter are relatively adjustable to increase or decrease the spacing of said transverse cutting line and the bite of said ply-forming webs.

6. The method of forming a continuous multi-ply web having patches between the plies thereof with the patches spaced at intervals along the length of the web, comprising the steps of feeding a plurality of continuous plyforming webs at a predetermined speed toward a combining guide in spaced paths with the webs converging together as they approach the guide and meeting at the guide, continuously feeding a continuous patch-forming web in a substantially straight-line path into the bite of the ply-forming webs at the combining guide at a speed lower than the speed ofsaid ply-forming webs, and cutting the patch-forming web on a line extending transversely across said straight-line path and spaced from the bite of the ply-forming webs a distance measured along said straight-line path corresponding generally to the desired patch length to form a patch substantially at the instant that the end of said patch as cut from the patchforming web is caught in the bite of said ply-forming webs, whereby the patch immediately upon being cut is drawn in between the ply-forming webs at the speed of the ply-forming webs, and is pulled away from the freshly cut end of the patch-forming web.

7. Apparatus for forming a continuous multi-ply-web having patches between the plies thereof with the patches spaced at intervals along the length of the web, comprising a combining guide, means for guiding a plurality of continuous ply-forming webs for travel at a predetermined speed toward the combining guide in spaced paths with the webs converging together to meet at the combining guide, a cutter comprising an anvil and a rotary knife located in the space between the ply-forming webs where they converge toward the combining guide, a pair of draw rolls for feeding a patch-forming web at a speed lower than the speed of said ply-forming webs between the anvil and knife into the bite of said ply-forming webs where they meet at said combining guide, the pass plane of said draw rolls and cutter being substantially tangent to the combining guide at the bite of said ply-forming webs, said knife being located to cut off the patch-forming web on a transverse cutting line spaced from the bite of said ply-forming webs a distance corresponding generally to the desired patch length, and being operable to cut the patch-forming web to form a patch substantially at the instant that the end of the patch-forming web is caught in the bite of said ply-forming webs, whereby the patch immediately upon being cut is drawn in between the ply-forming webs at the speed of the ply-forming webs, and is pulled away from the freshly cut end of the patch-forming web.

References Cited in the file of this patent UNITED STATES PATENTS 2,511,303 Stevens .Tune 13, 1950 FOREIGN PATENTS 755,343 France Sept. 4, 1933 

